梁在框架結(jié)構(gòu)中的約束剛度研究
王開強1,2，李國強1,3， 湯文科1
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梁在框架結(jié)構(gòu)中的約束剛度研究王開強1,2，李國強1,3， 湯文科1(1 同濟大學(xué)土木工程學(xué)院，上海 200092； 2 中國建筑第三工程局有限公司，武漢 430064；3 同濟大學(xué)土木工程防災(zāi)國家重點實驗室，上海 200092)［摘要］假設(shè)框架結(jié)構(gòu)中的梁軸向約束剛度僅來自于本層與上層柱的抗側(cè)剛度，考慮提供抗側(cè)剛度的柱遠端轉(zhuǎn)動約束剛度，推導(dǎo)了梁軸向約束剛度的計算公式。假設(shè)框架結(jié)構(gòu)的梁轉(zhuǎn)動約束剛度僅來自于與其相連的梁與柱，推導(dǎo)了梁轉(zhuǎn)動約束剛度的計算公式。采用一個4層6跨的平面框架結(jié)構(gòu)進行有限元分析，得到不同部位的梁約束剛度，將有限元結(jié)果與公式計算結(jié)果進行對比，證明了簡化模型與計算公式的有效性。［關(guān)鍵詞］ 框架結(jié)構(gòu)；約束剛度；軸向約束；轉(zhuǎn)動約束中圖分類號：TU375.1文獻標(biāo)識碼：A文章編號：1002-848X(2011)01-0091-04Research on restrained rigidity of beams in frame structureWang Kaiqiang1, 2, Li Guoqiang1, 3, Tang Wenke1(1 College of Civil Engineering, Tongji University, Shanghai 200092, China; 2 China Construction 3rd Engineering Bureau Co., Ltd.,Wuhan 430064, China; 3 State Key Lab for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China)Abstract:It is assumed that beams in frame structure are restrained by columns located in the same and upper stories with the studied beams in axial restriction. Explicit and simplified formulas of axial restrained rigidity of beams in frame structure were deduced based on the proposed assumption, which included the effect of rotational restrained rigidity of the columns that restrained the studied beams. It is also assumed that beams in frame structure are restrained by elements connected with the studied beams directly in rotational restriction. Formulas of rotational restrained rigidity of the studied beams were built based on the analytical model. The validity of the analytical model and the theoretical formulas were proved by comparing the results of finite element analysis and formulas of a 6 bays and 4 layers frame structure.Keywords:frame structure; restrained rigidity; axial restriction; rotational restriction國家自然科學(xué)基金創(chuàng)新研究群體項目“土木工程防災(zāi)”(50621062)，國家科技支撐計劃項目“高性能建筑結(jié)構(gòu)設(shè)計關(guān)鍵技術(shù)研究”(2006BAJ01B02)。作者簡介：王開強，博士，Email:wkq888@hotmail.com。參考文獻［1］WANG Y C, MOORE D B. The effect of frame continuity on the critical temperature of steel columns［R］. Proceedings of the 3rd international KERENSKY conference on global trends in structural engineering, Singapore, 1994.［2］NEVES I C. The column-structure interaction on the behavior of steel columns under local fire［D］. Lisboa: Instituto Superior Tecnico, 1983.［3］SHEPHERD P G. The performance in fire of restrained columns in steel-framed construction ［D］. Sheffield: University of Sheffield, 1999.［4］王培軍. 約束鋼柱抗火性能試驗與理論研究［D］. 上海：同濟大學(xué)，2008.
